/*
* FLINT PARTICLE SYSTEM
* .....................
* 
* Author: Richard Lord
* Copyright (c) Richard Lord 2008-2011
* http://flintparticles.org
* 
* 
* Licence Agreement
* 
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* 
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
* 
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/

package org.flintparticles.twod.initializers;

import nme.geom.Point;
import org.flintparticles.common.particles.Particle;
import org.flintparticles.common.emitters.Emitter;
import org.flintparticles.common.initializers.InitializerBase;
import org.flintparticles.twod.particles.Particle2D;
import org.flintparticles.twod.zones.Zone2D;

/**
 * The PositionAbsolute Initializer sets the initial location of the particle.
 * 
 * <p>The class uses zones to place the particle. A zone defines a region
 * in the coordinate space of the particle system, independent of the emitter's position,
 * and the particle is placed at a random point within
 * that region. For precise placement, the Point zone defines a single
 * point at which all particles will be placed. Various zones (and the
 * Zones interface for use when implementing custom zones) are defined
 * in the org.flintparticles.twoD.zones package.</p>
 */

class PositionAbsolute extends InitializerBase
{
	public var zone(zoneGetter, zoneSetter):Zone2D;
	
	private var _zone : Zone2D;

	/**
	 * The constructor creates a PositionAbsolute initializer for use by 
	 * an emitter. To add a PositionAbsolute to all particles created by an emitter, use the
	 * emitter's addInitializer method.
	 * 
	 * @param zone The zone to place all particles in.
	 * 
	 * @see org.flintparticles.common.emitters.Emitter#addInitializer()
	 */
	public function new( zone : Zone2D = null )
	{
		super();
		this.zone = zone;
	}
	
	/**
	 * The zone.
	 */
	private function zoneGetter():Zone2D
	{
		return _zone;
	}
	private function zoneSetter( value:Zone2D ):Zone2D
	{
		_zone = value;
		return _zone;
	}
	
	/**
	 * @inheritDoc
	 */
	override public function initialize( emitter : Emitter, particle : Particle ) : Void
	{
		var p:Particle2D = cast( particle,Particle2D );
		var loc:Point = _zone.getLocation();
		p.x = loc.x;
		p.y = loc.y;
		p.previousX = p.x;
		p.previousY = p.y;
	}
}
